Mini Motor Racing (& HD version for iPad) now FREE for a limited time on iTunes (One of the BEST arcade racer on iOS IMHO)
One of the best arcade racers (Asphalt 6 would be the other one) on iOS and highly rated! Get it while it's FREE! Enjoy!
Tip: Download the HD version if you're thinking of one day getting an iPad. You just never know, and the good thing is that the AppStore will register it as having "bought" the game so it will always be part of your online collection, ready for downloading anytime.